Tool-holder.



E. SCHLEGL.

TOOL HOLDER.

APPLICATION FILEQ AUG-28, 1915.

Patented Apr. 25,1916.

THE COLUMBIA PLANOGRAPH cm, WASHINGTON, n. 1:.

EMRICH SGHLEGL, 0F ASTORIA, NEW YORK.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Apr. 25, 121%.

Application filed August 28, 1915. Serial No. 47,725.

To all whom it may concern:

Be it known that I, EMRIoI-I SGI-ILEGL, a citizen of the Austrian Empire, and a resident of Astoria, Long Island, county of Kings, and State of New York, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

This invention relates to improvements in cutting tools, for use in metal-working lathes or other such machines.

It is an object of the invention to provide a universal shank with which the various working tools required for lathe and other such work may be readily used.

It is also an object to provide means to permit the ready removal and-adjustment of the tools, so that the various working angles and positions may be quickly and accurately determined, thereby enabling better and quicker work.

Another object is to provide such a device which will be simple in construction and inexpensive to manufacture.

With these and other objects in view, my invention is shown in the accompanying drawings, and will be hereinafter more fully described with reference thereto, and finally pointed out in the claims.

lfn the drawings: Figure 1 is a perspective view of the universal shank. Fig. 2 is a perspective view of the tool holding block in an inverted position. Fig. 3 is a perspective view of the fastening ring for securing the tool block to the shank. Fig. 4. is a side elevation showing the tool block secured to the shank. Fig. 5 is a vertical sectional view of the same. Fig. 6 is a top plan view thereof showing an adjusted position of the tool. Fig. 7 is a side elevation, showing a parting tool applied to my improved device. Fig. 8 is a front view thereof. Fig. 9 shows the parting tool in inverted position. Fig. 10 is a top plan view of a boring bar as applied to my improved device. Fig. 11 is a side view thereof. Fig. 12 is a top plan view showing an adjusted position of the boring bar, and Fig. 13 is a vertical sectional view on the line w'00 of Fig. 10.

Similar reference characters indicate corresponding parts throughout the several figures of the drawings.

Referring to the drawings, my invention comprises a shank 20 of rectangular cross section, having a head 21 of reduced thickness, and inclined therefrom, a wall 22 being formed at the jointure of the head with the shank. A central aperture 23 is provided in the head 21 and the forward edge of the head and the wall 22 form a portion of the circumference of a circle, described from the center of the said aperture. A pin or projection 24 is arranged centrally of the wall 22 and extends for substantially half of its width within the head portion 21.

The tool block 25 is of a shape corresponding to the face of the head 21, and is provided at its contacting side with flanged portions 26 and 27 in which are cut semicircularrecesses 28, preferably three in each flange, which are adapted to be engaged by the pin 24 for holding the block rigidly in position. A squared passage 29 is provided extending through the block in which is disposed the tool 30, one end 31 of which is in the form of a cutting tool and the other end 32 in the form of a finishing tool.

A central screw-threaded shank 33 is pro vided on the underside of the block 25, and extends through the aperture 23 in the head of the shank 20 a ring 31 being threaded thereon and bearing against the underside of head 21, for fastening the block securely to the head. Radial openings 35 are arranged in the ring 34 to permit tightening of the ring by means of a suitable wrench, after the same is first threaded onto the shank by hand. within the block, a bore 36 is provided, extending through the shank 33 to the squared passage 29. The outer portion of the opening is interiorly threaded and in the inner portion there is provided a plunger 3'7, held in place by means of a plug 38 threaded into the base and bearing against the underside of the plunger. A hexagonal or otherwise suitably shaped passage 39 is provided in the plug 38, so that the same may be readily turned by means of a suitable key or wrench. The forward end of the plunger 37 is beveled as at 40 and engages the tool, the inner edge of the bore being provided with a small inwardly extending rim 4-1,

which engages the beveled portion 40 to prevent the plunger from dropping into the passage 29. It will be seen that by tightcning of the flange 38 the tool will be securely held in the passage, and upon loosening, it may be readily removed.

In Figs. 4: and 5 the cutting tool is shown For retaining the tool in position on the head, the central recess 28 being engaged by the pin 24. When it is desired to change the cutting angle, or to change the tool from a right to a lefthand one, it is only necessary to loosen the ring 34 and bring the desired recess into engagement with the pin 24 whereupon the ring 34 is tightened and the tool is ready for use.

In Fig. 6, the finishing tool is brought into operating position by reversal of the block 25.

In Figs. 7, 8 and 9, there is illustrated a parting tool as applied in my improved device. In this form, the tool block 42 is of slightly greater width and of less thickness than the block 25. A tapered passage 43 is provided therein in which the parting tool 44is disposed, and single recesses 45 are "arranged at each end, which'are engaged by the pin 24. As it is not desirable or necessary to work with the parting tool at an angle, more than one recess in each end is not required. The parting tool is shown in Fig. 7 in the ordinary working position, but it is sometimes required to work upon material which is turning counter-clockwise in the lathe, in which case the block 42 is turned to the position indicated in Fig. 9, the tool is-removed and inserted through the passage 43 in the inverted position. The means for fastening the block to the head 21 and for securing the tool in the block are the same as in the first form of my invention.

In Figs. 10 to 13, I have shoWn my invention as applied to a boring bar. The tool block 46 is of rectangular design and is practically square in cross section. The lower portion of the block is contracted and rounded at the ends as at 47 and 48, to fit the head 21, and an outwardly extending flange 49 is provided at one side having its periphery formed continuous with the rounded ends 47 and 48. Recesses 50 and 51 respectively are provided centrally of the end 48 and the flange 49 and are adaptedto be engaged by'the pin 24. These recesses permit the block to be held in line with the head 21 or at right angles thereto, as indicated in Fig. 12, these being the two positions in which the boring bar is operated. A circular passage '52 is provided extending through the block 46 in which the boring bar 53 is disposed, and held in place by means of a key 54 provided in a slot 55 along the said passage, the said key being forced against the boring bar by means of a plunger and threaded plug, as in the foregoing forms of construction.

At the forward end of the boring bar, the cutting member 56 is disposed in an inclined passage 57 and is held in position therein by means of a set screw 58. This construction permits the ready removal or advancing of the cutting member, for removal or sharpeningpurposes.

It will be understood that other forms of tools than those illustrated may be used with my improvements, and aside from its use on a lathe, the device may also be advantageously used on planers, and other similar metal working machines.

I have illustrated a preferred and satisfactory form of my invention, but it is obvious that changes may be made therein within the spirit and scope thereof as defined in the appended claims.

I claim:

1. An improved tool holder, comprising a shank, a head provided with an opening therethrough, an arcuate abutment wall at the rear of said head, a tool holding block adapted to hold a tool, and provided with a circumferential engaging portion, the said abutment wall adapted to engage portions of said circumferential engaging portion in different working positions of said block, said abutment wall adapted to resist working strains on the tool, means for securing the said block to the said head, and immovable means on one of said members adapted to engage fixed predetermined points on the other ofsaid members to form a non-yielding connection therebetween against rotation, said fixed points determining accurate positions for known operations.

2. An improved tool holder, comprising a shank, a head angularly offset from said shank, providedcentrally with an opening 'therethrough, an arcuate abutment wall at the rear of said head, a tool holding block provided with a slot therein, a tool adapted to be inserted in said slot, means for holding said tool insaid slot, a shank on said block adapted to be inserted into the opening of the head, means cooperatingwith said shank to rotatably secure the block to said head, a circumferential engaging portion on said block, said abutment wall adapted to engage portions of said circumferential engaging portion in different working positions of said block, said abutment wall adapted to resist rearward Working strains on the said tool, and immovable means on the said head adapted to engage predetermined points on the said block, to form a nonyielding connection therebetween against rotation, said points determining accurate positions for known operations, said immovable means adapted'to resist side working strains on the said tool.

3. An improved tool holder, comprising a shank, a head provided with an opening therethrough, an arcua'te abutment wall at the rear of said head, a tool holding block adapted "to hold a tool and provided with a circumferential engaging portion, the said abutment wall adapted to engage portions of tloptes of this patent may be obtained for adapted to determine accurate positions for known operations, said pin adapted to resist side Working strains on the said tool.

In testimony that I claim the foregoing 15 as my invention, I have signed my name in presence of two subscribing Witnesses.

EMRICH SGHLEGL.

Witnesses:

D. LEWIS MATTERN, Jos. H. BISBANQ.

five cents each, by addressing the "Commieetoner of Patents.

Washington, D. 0." 

